You don't want for PATH to be invalidated at each update, especially since they are snapshots, and you don't want to break scripts/makefiles simply because it was updated.
+*ekopath-4.0.10_pre20110717-r1 (31 Jul 2011) + + 31 Jul 2011; Kacper Kowalik <xarthisius@gentoo.org> + -ekopath-4.0.10_pre20110717.ebuild, +ekopath-4.0.10_pre20110717-r1.ebuild: + Use PN rather than P in path, in order not to break things relying on + compiler location on every update. Fixes bug 377113 by Diego Elio Pettenò + <flameeyes@gentoo.org>